<template>
  <div>
    <p>count值：{{ count }}</p>
    <button @click="add">加n</button>
  </div>
</template>

<script setup>
import { ref } from "vue";
const emit = defineEmits(["updateCount"]);
const count = ref(1);
const add = () => {
  count.value++;
  emit("updateCount", 2);
};
</script>

<style lang="scss" scoped></style>
